I've enjoyed AbandonedBronco's thread Upgrading a 300 carb Straight Six. (Pics)
I am taking his advice on the exhaust system. I have all the system components except for the header pipe for the FI manifolds. It seems to be hard to get right now, but Summit is supposed to have it soon so I ordered it. Hopefully they will come through. I was going to go with the Offy intake also, but a co-worker offered me a good deal on a NOS Edelbrock for the single barrel carb, so I'm going to give it a try. My builder is going to do a 3 angle valve, but other than these upgrades, it is going to be stock. I'm going more for dependability and economy than high performance.